Thanks to everyone on here talking about cabon monoxide detectors I bought a second one. I installed it in my living area by the cellar doorway. Already had one in basement. At 3:30 am this morning night hawk went off waking us up (thankfully). So I sent the wife and kids to grandpas then I shut keystoker off. I then left myself. I came back home at 6:00 am kidde reading 00 i checked last readin and it said 42. When it went off it was reading 242. So later today i will switch to oil boiler (darn) but i was going to shut down friday for weeks vacation anyways. I am thinking chimmney pipe plugged with fines ? Could that cause this ? Planning major take down and cleaning when i get back from vacation. Does that sound like the right thing to do to fix this? Anything else i should be looking for ? Thanks again for the reminders about the detectors. I almost forgot we took the dog also don't want anyone thinking we left Harley behind.

Glad you had the CO alarm! The chimney and smoke pipe are the first places to start. I've cleaned fines out of my smoke pipe twice already. I've made mine easy to clean by using T's instead of elbows. I can notice a slight change in my manometer readings and that's the first clue that it's time.

My first thought is that there is insufficient make-up air available to the boiler. My next thought is that your small combustion fan that keeps the fire burning is blowing too much air into the combustion area.

If the chimney is built up through the home and is sufficiently high, you shouldn't be having draft problems in mild weather.

I too have had an experience with my CO detector this week. Mine was all my doing but still the detector did exactly what it was designed to do and everyone got out safely. just go's to show that CO detectors do save lives. and anyone reading this that does not have at least one GO BUY ONE!!!! Its cheap insurance. you can pick one up for $20 and it could save your life.

Just a reminder that Berlin has pointed out several times that your house also acts like a chimney. With low outside pressure a chimney can reverse.

I have a raised ranch and with a cold stove on the lower level I can hold a match to the flue outlet inside the stove and the match blows in. If I open the sliding door 3 feet away the draft immediately goes to neutral and the match flame stays upright. With the door closed the house acting as a chimney pulls air down the stove chimney. This limits how low I can keep a fire and still have draft. A stoker with forced combustion air would be worse. The stove on the upper level has none of these problems. A good solution would be to supply outside air for combustion because it eliminates the house acting as chimney.